defer to GenericCataloger instances for pkg catalogers

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

syft/cataloger/javascript/cataloger.go

@@ -4,40 +4,15 @@ Package javascript provides a concrete Cataloger implementation for JavaScript e
 package javascript
 
 import (
-	"github.com/anchore/stereoscope/pkg/file"
 	"github.com/anchore/syft/syft/cataloger/common"
-	"github.com/anchore/syft/syft/pkg"
-	"github.com/anchore/syft/syft/scope"
 )
 
-// Cataloger catalogs pkg.YarnPkg and pkg.NpmPkg Package Types defined in package-lock.json and yarn.lock files.
-type Cataloger struct {
-	cataloger common.GenericCataloger
-}
-
-// New returns a new JavaScript cataloger object.
-func New() *Cataloger {
+// NewJavascriptCataloger returns a new JavaScript cataloger object.
+func NewJavascriptCataloger() *common.GenericCataloger {
 	globParsers := map[string]common.ParserFn{
 		"**/package-lock.json": parsePackageLock,
 		"**/yarn.lock":         parseYarnLock,
 	}
 
-	return &Cataloger{
-		cataloger: common.NewGenericCataloger(nil, globParsers),
-	}
-}
-
-// Name returns a string that uniquely describes this cataloger.
-func (a *Cataloger) Name() string {
-	return "javascript-cataloger"
-}
-
-// SelectFiles returns a set of discovered Javascript ecosystem files from the user content source.
-func (a *Cataloger) SelectFiles(resolver scope.FileResolver) []file.Reference {
-	return a.cataloger.SelectFiles(resolver)
-}
-
-// Catalog returns the Packages indexed from all Javascript ecosystem files discovered.
-func (a *Cataloger) Catalog(contents map[file.Reference]string) ([]pkg.Package, error) {
-	return a.cataloger.Catalog(contents, a.Name())
+	return common.NewGenericCataloger(nil, globParsers, "javascript-cataloger")
 }